The number of VLP seismic events (standard values 5-12) is medium, 11 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is medium, 1.2 bar (standard values <1 bar). The amplitude of puffing is medium, ~90 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is not available. The number of thermal transients in the NE sector of the crater(standard = 100) is not available. The amplitude of thermal transients is not available. Exit velocity of pyroclasts, estimated through thermal camera analysis, is not available.

MODIS thermal anomalies are low: 1 MW (20:35 UTC yesterday).

Rockfall activity is high. The number of rockfalls is 16 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 95 t/d

CO₂ flux based on the C/S of 6.83 mesured at 07:20 UTC on 2024/12/17 is medium, 984 t/d

Indice di Attività Vulcanica: high

• Seismic (VLP) rate MEDIUM
• Seismic tremor HIGH
• Puffing MEDIUM
• Acustic pression of explosions MEDIUM
• Thermal activity NOT AVAILABLE
• SO₂ flux MEDIUM
• CO₂ flux MEDIUM
• Rockfall activity HIGH

The volcanic activity is generally characterized by strombolian explosions and degassing (puffing/spattering) both located at the NE crater sector. Spattering is characterized by HIGH to VERY HIGH values of pressure and this activity is correlated with seismic tremor characterized by HIGH values. In the last 24h, the Stromboli volcano showed a HIGH degassing activity (puffing/spattering with values of about 90 mbar). The explosive activity is MEDIUM (max acoustic pressure 1.2 bar). The volcanic tremor shows HIGH to MEDIUM values. The number of VLP events shows MEDIUM values (11.0 events/hour). MODIS/VIIRS thermal data shows LOW thermal anomalies (max 1 MW). SO2 flux shows MEDIUM values (last: 95 t/d recorded on the 17/12/2024), CO2 flux shows MEDIUM values (last: 984 t/d based on C/S value of 6.83 recorded on the 17/12/2024). The rockfall activity is HIGH (n.16 events detected with LOW to MEDIUM pseudo-volumes associated). The volcanic activity index is HIGH.